Under normal conditions, the ATS supplies the load from the utility power. When the utility power fails or abnormal conditions such as under-voltage, over-voltage, or phase loss are detected, the ATS automatically transfers the load to the standby power source or diesel generator according to the preset control logic. When utility power is restored and confirmed stable, the ATS automatically transfers the load back to the utility supply.
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FAQ
Q: What is an ATS and what does it do?
A: ATS stands for Automatic Transfer Switch. It automatically transfers electrical loads between the utility power and a standby power source, such as a diesel generator. When utility power fails or becomes abnormal, the ATS transfers the load to the backup source and automatically switches back when utility power is restored and stable.
Q: Can an ATS be used with a diesel generator?
A: Yes. ATS units are commonly used together with diesel generators. When utility power fails, the ATS can send a start signal to the generator. Once the generator reaches stable operating conditions, the ATS transfers the load to generator power. When utility power returns, the ATS transfers the load back and the generator can stop after a preset cooling delay.
Q: How do I choose the correct ATS capacity?
A: ATS capacity should be selected based on the maximum load current, system voltage, phase configuration, load type, and starting current. For example, a 160A ATS is suitable for distribution systems within its specified rated operating current. Loads such as motors, pumps, and air-conditioning equipment require special consideration because of their higher starting current.
Q: Does the ATS support automatic and manual operation?
A: Most ATS units can provide automatic and manual operating modes, depending on the configuration. In automatic mode, the ATS transfers the load according to the status of the utility and standby power sources. Manual mode is useful during commissioning, maintenance, or special operating conditions. Some intelligent ATS systems can also provide power status monitoring, fault alarms, and operating-status indication.
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